Spring sash-balance.



. MAOLAUGHLIN & J. L. WILLARD SPRING SASH BALANCE.

APPLICATION TILED FEB. 19

Patented Dec. 23

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TTTED PATENT OFFTCE.

GEORGE J. MAGLAUGHLIN AND JAY L. \VILLARD, OF ROCHESTER, NEW YORK, ASSIGNORS TO PULLMAN MANUFACTURING COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

SPRING SASH-BALANOE.

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Specification of Letters Patent.

il'atented Dec. 22;, .1913.

Application filed February 19, 1913. Serial No. 749,558.

To all whom it may concern:

Be it known that we, Gnome J. Mac- LAUG'IILIN and JAY L. lVinmne, citizens of the United States, and residents of ltocnester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Spring Sash- Balances of which the following a speciti cation.

This invention relates to sash-balances of the type in which a coiled spring is employed to actuate a pulley, upon which is wound a band or cord connected with the window'sash.

The object of the invention is to produce a saslnbalance of the type in question having a novel and simple construction and arrangement by which the operation of the device is improved, and its manufacture simplified, particularly by facilitating the em ployment of a sheet-metal construction of the parts in place of the cast construction heretofore employed.

To this end the invention consists in the construction and arrangement of parts hereinafter described, as they are defined in the succeeding claim.

In the accompanying drawings :1 igure 1 is a sectional elevation of a sash-balance embodying the present invention, on a cen tral plane normal to the axis of the pulley; Fig. 2 is a section on the line 2-2 in Fig. 1; and Fig. 23 is a side-elevation, looking from the left in Fig. 2, showing in detail the pulley-casing, the pulley, and the pivotmember in their operative relation.

The invention is illustrated as embodied in a sash-balance of which all of the prineipal parts are constructed of sheet-metal, the balance being of the type which is seated in a mortise in the side of the window-frame. The illustrated balance has the usual faceplate 5, which is screwed against the inner surface of the window-frame, and which has lateral ears 6, bent backwardly so as to extend into the mortise and provide supports for the other parts of the mechanism. The cars 6 embrace the pulley-casing, which comprises a side-wall 7, and a flange 8 which incloses the periphery of the pulley. The pulley is stamped of a single piece of sheetmetal and comprises a webportion t), a rim 10, and an intermediate flange 11. The

flexible member by which the pulley is conneeted with the 'indow-sash is in the form of the usual metal ribbon or band 12, which is wound upon the rim 10 of the pulley and looped at one end, as shown in Fig. 1, through openings in the rim of the pulley, being thus fastened thereto. The coiled spring 12-3 is of the usual form, having one end It fastened to the rim of the pulley, while its inner end is fastened to the central pivot-member.

The novelty of the present invention resides particularly in the construction of the central pivotanember 15. This member, as shown in the drawings,comprises a cylindrical body which is slotted longitudinally to receive and retain the inner end 16 of the spring 13. At its ends the pivot-member is provided with pintles 17 and 18, which are seated in perforations in the ears 6 of the face-plate, and fastened therein by upsetting their ends, as shown in Fig. 2. The pintle f7 forms also a bearing for the web 9 of the pulley. As this hearing is comparatively narro and is located entirely at one side of the band 12, it will be apparent that the pull of the band upon the pulley tends to move the pulley angularly upon its bearing. This movement; is prevented, however, by the engagement of the flange 11 with the edge of the pulley-casing, and in this manner a certain amount of friction produced proportionate to the tension of the band. The mechanism acts, therefore, in an automatic manner to provide the necessary friction to prevent the balance from raising the sash freely.

To prevent the pivot-member from rotating the pintle 18 is provided with a widened portion 19 having flat lateral surfaces, and this part 19 fits within an opening of corresponding form in the part; 7 of the pulleycasing. 'Since the pulley using is prevented from rotation by engagement of its front extremity with the face-plate, the pivotmcmber is thus securely locked against rotation. so as to provide a firm anchorage for the inner end of the spring 1?).

The construction just described facilitates the manufacture of the sash-balance, particularly with respect to the pulley and the pulley-casing, since it permits these parts to be formed of sheetanctal, without any axial sleeves or extensions to provide bearingmembers or an anchorage for the spring,

larged portion constituting an anchorage for 5 the inner end of the spring, one of said pintles forming a bearing for the Web-portion .it the pulley, and the other pintle having a non-circular portion, and the pulley-casing having a non-circular opening embracing said non-circular portion and preventing rotation of the pivot-member.

GEGRGE J. Il IAQLAUGHLIN. JAY L. WILLARD.

lVitnesses:

C. S" DAVIS, D. Gunman.

tloples 01? this; may he obtained for five cents each, by addressing the Commissioner of Patents,

"Washington, D. C. 

